/****************************************************************************
 * libs/libc/math/lib_cbrt.c
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.  The
 * ASF licenses this file to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the
 * License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>
#include <nuttx/compiler.h>

#include <sys/types.h>
#include <math.h>
#include <float.h>

#ifdef CONFIG_HAVE_DOUBLE

/****************************************************************************
 * Public Functions
 ****************************************************************************/

double cbrt(double x)
{
  if (fabs(x) < DBL_EPSILON)
    {
      return 0.0;
    }

  if (x > 0.0)
    {
      return pow(x, 1.0 / 3.0);
    }
  else
    {
      return -pow(-x, 1.0 / 3.0);
    }
}

#endif